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Hi all,I've been facing with a problem with my LMDE : after a random time, my UI is partially frozen : I can move my mouse, but I am not able to click anywhere. In the same way, some of my keyboard shortcuts are not working either(for example alt+tab).

This is currently the cinnamon interface. In fact whether I start on Mate on cinnamon, I have to restart Xorg at least once before it can be used. Otherwise my interface seems totally frozen.I have a Nvidia gtx 560ti, and have successfully installed the drivers for it. Can it still be a driver problem?